Question

此查询针对同一个表（qcheck）运行多个计数，以便为我提供每个工程师分解为小时，天，周，月的测试总数。我还包括结果和数据的屏幕截图。

我想汇总所以我可以得到总数但不知道如何在使用子查询时这样做，因为我可以将总数加入任何东西

代码：

expect(my_array).to any(include(id: 5))

Answer 1

由于连接条件xxxx.checkby =main.checkby，子查询中生成的汇总行将丢失。当任何一方为false时，此条件为null。特别是：null = null是false。

此外，您可能会遇到一些边境情况，您将有一个星期超过两个月，因此一周的计数可能会超过当月的计数。这本身不是问题，但join链以每月计数开始的方式，您可能会错过每周计数中的一些记录。即，当前月份尚未记录的人的每周记录将不会计入周统计数据。

您获得的null值是外部（left）联接的结果。当外部连接条件为false时，righter连接表上的所有字段（也是计数）在引用时将产生null。

所有上述问题都可以通过一个大的子查询来解决，使用更精细的case when条件而不是where条件：

select    *
from      (
          select   coalesce(checkby, 'Total') as checkby_or_total,
                   count(case when last_day(finishdate) = last_day(curdate())
                               and result = 'fully tested & working' 
                         then 1 end) as mfully,
                   count(case when last_day(finishdate) = last_day(curdate())
                               and result = 'faulty' 
                         then 1 end) as mfaulty,
                   count(case when last_day(finishdate) = last_day(curdate())
                         then 1 end) as mtotal,
                   count(case when date(finishdate) = curdate()
                               and result = 'fully tested & working' 
                         then 1 end) as dfully,
                   count(case when date(finishdate) = curdate()
                               and result = 'faulty'
                         then 1 end) as dfaulty,
                   count(case when date(finishdate) = curdate()
                         then 1 end) as dtotal,
                   count(case when yearweek(finishdate) = yearweek(curdate())
                               and result = 'fully tested & working' 
                         then 1 end) as wfully,
                   count(case when yearweek(finishdate) = yearweek(curdate())
                               and result = 'faulty'
                         then 1 end) as wfaulty,
                   count(case when yearweek(finishdate) = yearweek(curdate())
                         then 1 end) as wtotal,
                   count(case when finishdate >= now() - interval 1 hour
                               and result = 'fully tested & working' 
                         then 1 end) as lfully,
                   count(case when finishdate >= now() - interval 1 hour
                               and result = 'faulty'
                         then 1 end) as lfaulty,
                   count(case when finishdate >= now() - interval 1 hour
                         then 1 end) as ltotal
          from     qcheck
          where    checkby not in ('michael', 'chaz')
          group by checkby with rollup) as main
order by  checkby_or_total = 'Total',
          mtotal desc

我还介绍了一些不同的条件：

使用last_day(finishdate) = last_day(curdate())
当天的条件可能是date(finishdate) = curdate()，尽管这与您使用的条件不完全相同。但也许你想考虑这个。

使用Rollup和子查询

1 个答案: